On 17/04/2024 12:09 pm, Michael Oujesky wrote:
Yes and zEDC poorly compresses internally RLE compressed records.
I was surprised how well zEDC compressed the already compressed records.
Using my data:
zEDC alone : 52000 tracks
CICS compression + zEDC : 22000 tracks
zEDC seems to be biased towards speed rather than compression ratio, so
maybe the RLE compression helps by packing more repeated bytes into
whatever compression window zEDC uses?
Plus CSRCESRV uses GP engine cycles
That's true - CPU is probably more expensive than storage, so this could
be just an interesting side-track. On the other hand, I think zEDC has
to decompress and recompress the data for SMF dump etc. so CICS
compression might save some overhead for SMF housekeeping type
operations, reducing the amount of data going through zEDC?
--
Andrew Rowley
Black Hill Software
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